eu.geclipse.ui.internal.actions.ManagePermissionsAction.java Source code

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Here is the source code for eu.geclipse.ui.internal.actions.ManagePermissionsAction.java

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/*****************************************************************************
 * Copyright (c) 2008 g-Eclipse Consortium 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Initial development of the original code was made for the
 * g-Eclipse project founded by European Union
 * project number: FP6-IST-034327  http://www.geclipse.eu/
 *
 * Contributors:
 *    Ariel Garcia - initial API and implementation
 *****************************************************************************/

package eu.geclipse.ui.internal.actions;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.actions.SelectionListenerAction;

import eu.geclipse.core.ICoreProblems;
import eu.geclipse.core.accesscontrol.IACL;
import eu.geclipse.core.model.IProtectable;
import eu.geclipse.core.reporting.ProblemException;
import eu.geclipse.ui.dialogs.AccessControlDialog;
import eu.geclipse.ui.dialogs.ProblemDialog;
import eu.geclipse.ui.internal.Activator;

/**
 * The action to access the permissions management dialog.
 * 
 * @author agarcia
 */
public class ManagePermissionsAction extends SelectionListenerAction {

    private IWorkbenchSite site;

    /** The <code>IProtectable</code> elements whose permissions should be managed */
    private List<IProtectable> selectedElements;

    /**
     * Constructs the action for opening the ACL editor.
     * 
     * @param site the {@link IWorkbenchPartSite} where this action will be present.
     */
    public ManagePermissionsAction(final IWorkbenchPartSite site) {
        super(Messages.getString("ManagePermissionsAction.title")); //$NON-NLS-1$
        super.setToolTipText(Messages.getString("ManagePermissionsAction.tooltip")); //$NON-NLS-1$

        this.site = site;
        this.selectedElements = new ArrayList<IProtectable>();
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.action.Action#run()
     */
    @Override
    public void run() {

        if (this.selectedElements == null) {
            return;
        }

        List<IACL> aclList = new ArrayList<IACL>();

        try {
            Iterator<?> it = this.selectedElements.iterator();
            IProtectable next;
            while (it.hasNext()) {
                next = (IProtectable) it.next();
                IACL acl = next.fetchACL(null);
                if (acl == null) {
                    throw new ProblemException(ICoreProblems.ACCESSCONTROL_INVALID_ACL,
                            Messages.getString("ManagePermissionsAction.null_ACL_error"), //$NON-NLS-1$
                            Activator.PLUGIN_ID);
                }
                aclList.add(acl);
            }

            // All elements of the list must be of the same type, so query the first
            boolean saveAsWhole = aclList.get(0).canSaveWholeACL();
            AccessControlDialog dialog = new AccessControlDialog(aclList, saveAsWhole, this.site.getShell());
            dialog.open();

        } catch (ProblemException pe) {

            ProblemDialog.openProblem(this.site.getShell(),
                    Messages.getString("ManagePermissionsAction.error_fetching_ACL_title"), //$NON-NLS-1$
                    Messages.getString("ManagePermissionsAction.error_fetching_ACL_description"), //$NON-NLS-1$
                    pe);

            Activator.logException(pe);
        }

    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.ui.actions.BaseSelectionListenerAction#updateSelection(org.eclipse.jface.viewers.IStructuredSelection)
     */
    @Override
    protected boolean updateSelection(final IStructuredSelection selection) {

        Class<?> type = null;
        IProtectable protectable;

        this.selectedElements.clear();
        boolean enabled = super.updateSelection(selection);

        Iterator<?> it = selection.iterator();
        while (enabled && it.hasNext()) {

            Object next = it.next();
            protectable = null;

            // Connection elements do not implement IProtectable directly but adapt to it
            if (next instanceof IProtectable) {
                protectable = (IProtectable) next;
            } else if (next instanceof IAdaptable) {
                IAdaptable adaptable = (IAdaptable) next;
                protectable = (IProtectable) adaptable.getAdapter(IProtectable.class);
            }

            // Enable only if the selected elements implement the interface
            if (protectable != null) {
                this.selectedElements.add(protectable);
            } else {
                enabled = false;
            }

            // Enable only if all the selected elements are of the same type
            if (type == null) {
                type = next.getClass();
            } else if (type != next.getClass()) {
                enabled = false;
            }
        }

        // TODO allow editing multiple objects at the same time (if canSaveWholeACL() == true)
        if (this.selectedElements.size() > 1) {
            enabled = false;
        }

        return enabled && !this.selectedElements.isEmpty();
    }

}